n. [ Pref. sur- + base. ] 1. (Arch.) A cornice, or series of moldings, on the top of the base of a pedestal, podium, etc. See Illust. of Column. [ 1913 Webster ]

2. A board or group of moldings running round a room on a level with the tops of the chair backs. Knight. [ 1913 Webster ]

a. (Arch.) (a) Having a surbase, or molding above the base. (b) [ F. surbaissé. ] Having the vertical height from springing line to crown less than the half span; -- said of an arch; as, a segmental arch is surbased. [ 1913 Webster ]